i´m doing a directoryopus like program, but i have a problem with drives, i can add the amiga drives using info command with no problem, but if i compile under windows and i attempt to use (exists c: d: e: ... etc) to add drives if any drive is not found, the program tells an error if any drive is not found an exit, is possible bypass this error for check the drives?

It is an unfortunate situation, this is the downside of trying to keeping Hollywood platform independence. How far do you bend your code to match target platforms? That is the question Andreas is surely faced with. Its all about priorities.